despite the billions spent and the thousands of lives lost, the taliban has not been defeated. some say at the america pulls out too quickly, it will be trade promises made and leave afghanistan vulnerable. >> it will be difficult to engage down the road if there is a large al qaeda return or the taliban takes over the country, to get the afghanistan's to trust us when we say we will be there to help you. >> america described it as the final chapter in afghanistan. president obama downsized out of the ambitions, winding down the war that is increasingly unpopular at home. this is not the final chapter. that is just that americans have grown wary about spending the money and spilling the blood. >>> for more on the future of the u.s. mission, i spoke a short time ago with the former u.s. ambassador to afghanistan. ambassador, thank you very much for coming in. president obama says that things are going so well he can actually speed up the transition. are the afghan security forces really ready to take over in the spring or is this more a matter of expediency for both countries? >